43281987840 has 1728 divisors, whose sum is σ = 202491394560. Its totient is φ = 8281128960.

The previous prime is 43281987829. The next prime is 43281987863. The reversal of 43281987840 is 4878918234.

It is a happy number.

43281987840 is a `hidden beast` number, since 432 + 81 + 98 + 7 + 8 + 40 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 816641254 + ... + 816641306.

It is an arithmetic number, because the mean of its divisors is an integer number (117182520).

Almost surely, 2^43281987840 is an apocalyptic number.

43281987840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43281987840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101245697280).

43281987840 is an abundant number, since it is smaller than the sum of its proper divisors (159209406720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

43281987840 is a wasteful number, since it uses less digits than its factorization.

43281987840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 43281987840 in words is "forty-three billion, two hundred eighty-one million, nine hundred eighty-seven thousand, eight hundred forty".